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According to the characteristics of domestic polyurethane raw materials, jiteng's product absorbs foreign filtration technology and is equipped with a 200 micron filter on the isocyanate side of the equipment and a 300 micron filter on the polyether side. The filtration effect is excellent. The self-cleaning filter is also known as the scraper filter. The raw material medium enters the material barrel through the feed port, and is filtered from the outside to the inside through the clearance of the filter element The material flows from bottom to top to the upper outlet. The impurities larger than the clearance of the filter are intercepted. After the filter assembly runs for a certain time, the clearance of the filter element is blocked by impurities. The driving device drives the filter element assembly to rotate (each scraper of the scraper assembly is just inserted into the clearance of the filter element assembly) to make the impurities scrape away from the clearance of the filter element and keep the clearance of the filter element unblocked. When the impurities at the bottom of the barrel increase, as long as the slag valve at the bottom is opened, the impurities will be discharged smoothly and the system pressure will be kept normal. The self-cleaning filter is equipped with a blade in each filtration gap. Driven by the hand wheel or the reducer motor, the rotating blade scrapes off the impurities in the filtration gap in time, eliminating the trouble of removing and washing the filter screen, and keeping the raw materials unobstructed. Large capacity scraper filter. It is a self-cleaning filter composed of stationary, moving and scraping blades. Keep the raw materials smooth and filtered in the circulation. The polyether side is equipped with a 300 micron self-cleaning filter, and the isocyanate side is equipped with a 200 micron self-cleaning filter.